Mining-drill



. H 3 Sheets-Sheet 1. R. H. ELLIOTT & J. B. OARRINGTON.

7 (No del-) MINING DRILL.

Pa-telltedDe-c. 11 1 "3 Sheets-Sheet 2."

{no Model.)

B. H. ELLIOTT & J. B. OARBING'TON.

MINING DRILL.

N0, 530,511.v Patented Dec. 11; 1894.

7m; warns Prrzns cu. rumou'rnou yasnmm'ou. b. c.

, I 3 SheetsShee1; 3. R H. :ELLIOTT 85 J; B. CARRINGTON.

(No Model.)

MINING DRILL.

No. 530,511. Patented 1m. 11, 1894] ETERS so. PnoTvS-umQ, :WASHINQTON o c UNITED STATES PATENT OFFICE.

ROBERT n. ELLIOTT, or BIRMINGHAllLAND JOHN B. CARRINGTON, or JASPER, ALABAMA.

MINING-DRILL.

SPECIFICATIQN forming part of Letters Patent No. 530,511, dated December 11, 1894.

Application filed February 20,1894. Serialllo. 500,910. (No model.)

residing at Birmingham, in the county of J eiferson, and JOHN B. CARRINGTON, residing at Jasper, in the county of Walker, State of Alabama, citizens of the United States, have invented certain new and useful Improvements in Mining-Drills; and we do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the a'rtto which it appertains to make and use thesame.

Our invention relates to improvements in mining drills, and it consists in certain novel means for enlarging the cavity already bored by a drill of ordinary construction, and in means for removing the chips or borings made in said cavity. X

Reference is' had to the accompanying drawings, in which the same parts are indi cated by the same letters.

Figure 1 represents one form of the herein described drill in operation) Fig. 2 represents an end view of the hand crank for revolving the drill shown in Fig. 1, and of the adjusting tudinal section of the device shown in Fig. 2.

Fig. 4 represents an enlarged view of the outer end of the device shown in Fig. 1. Fig. 5 represents a diagram of the gear wheels shown in Figs. 1 and 4. Fig. 6 represents an enlarged detailed view of the cutting blade shown in Fig. 1. Fig. 7 represents a detail view of a modification of the device shown in Fig. 6. Fig. 8 represents a further modification of the devices shown in Figs. 6 and 7. Fig. 9 represents a central longitudinal section of the outer end of an air blast tube adapted to use in our invention, and separated by a longitudinal partition into a delivery and return air passage. Fig. 10 represents a plan view of the toggle-joint cutting blades shown in Figs. 1 and 6. Fig. 11 represents a section along the line 2 z of Fig. 6,

and looking to the right. Fig. 12, represents an end view of the tube and contents shown in Fig. 6, as seen from the outer end a of the said tube. Fig. 13, represents a plan view of the cutting device shown in Fig. 7, as derepresents asection along the line a: w of Fig. 7,'and looking to the right. Fig. 15 represents a section along the line y y of Fig. 7, and looking to the right. Fig. 16, represents a sectional view of therrevoluble connection between the adjusting rod and the blade tripping device shown in Fig. 8. Fig. 17 rep resents a section along the line 3 y of Fig. 8. Fig. 18 represents a section along the line 2 z of Fig. 8, and looking to the right. Fig. 19, represents a section along the line :0 m of Fig. 8, and looking to the left, and Fig. 20 represents a section along the line 2 2 of Fig. 9. i

In the various figures, A represents an air strong enough to form a spindle or driving shaft for the cutting tool. 'It is closed at its inner end, and open at its outer end a, and also near said outer end as at a. to allow the cutting blade or bladesto be moved out into the operative position: The closed end of said tube is rigidly attached to the crank B operated by the handle I), but any other device for revolving the said tube may be substituted for the handle and crank aforesaid. Air is supplied to the said tube through slots a frorna bent pipe 0 which is closed at its upper end, and in which the pipe A is revolubly mounted as shown in Fig. 4. The outer end of the pipe abuts against the frame N, and the said pipe has ports 0 for the admission of air. Mounted in this pipe is a fan 1) mounted on the shaft 01 and driven by the pinion D. This pinion meshes in a gear wheel E mounted on the same shaft c, with the pinion E, which gears in the spur wheel F fast on the tube A.

frame N, which is suspended from the tube A, and may be of any desired construction.

It will be seen that a slow revolution of the revolution of the fan D, and hence will blow air under pressure into the tube A.

It will be obvious from the description hereinafter contained, that air pressure from any other source might be used in the invention.

tached from its connecting parts. Fig. 14

The shafts d and e are journaled in the tube adapted to enter into a hole already drilled in the usual way. Thistube is made hand crank B will cause a much more rapid too Mounted in the tube A near the inner end thereof, we provide a cutting tool which may be moved outward or inward away from or toward the axis of the said tube. In Figs. 1, 6, 10, 11, and 12, this cutting tool consists of a toggle joint G made of steel or other hard metal, and having the arms 9 and g pivoted together at g, and revolubly connected at their opposite ends to the nuts engaging on the oppositely-disposed screw threads k on the adjusting rod K. These nuts k are made to fit the lower side of the tube A so that as rod K is revolved the nuts may not turn round, and so prevent the toggle joint G from entering fairly into the slot a in the tube.

The outer end of the rod K is provided with a nut 70 and the said rod passes through bearings a secured by screws a to the tube A. The rod K is revolved by means of the hand crank 70 and handle 70. The latter may be provided with a spring m, and pawl m, adapted to engage in the recesses b in the face of the hand crank B.

It will be evident that by turning the crank 70, the toggle joint may be moved from the position shown in Fig. 1, to that shown in Fig. 6, and that the said pawl m will hold the said crank 70 in any desired position.

In the form of device shown in Figs. 7, 13, 14, and 15, the toggle joint G has one of its arms g pivoted to the bearing a fast in the tube A, while the opposite arm g is pivotally attached to the nut k similar to the nuts 70 already described with reference to Fig. 6. The arm g is slotted as at g, in which slot the arm 9 is pivoted as at g, and the said arm g is provided with an outwardly-projecting cutting portion g which is thrown out or drawn in by the revolution of therod K.

In the form of device shown in Figs. 8, 16, 17, 18 and 19, the cutter G is pivoted between the lugs a in the tube A, as at 9 and the cutting edge 9 is moved outward by the sliding block K pressing on the face 9 This block K is curved as at 70 to engage the said face 9 as the said cutter G swings upward. The block K is moved longitudinally between guide lugs a in the tube A, and is revolubly connected by means of the neck 70, flange k, and union K to the flange 70 on the end of the rod K as shown in Fig. 16. For convenience in manufacture this union K is made in two parts, perforated as at 70 to receive the holding screw 70 by which the two parts are held together. I The rod K is provided with a screw thread 10 meshing in a nut a in the end of the tube A, and longitudinal motion is given to the block K by turning the hand crank 70.

It will be seen that as the block K is moved to the left, the cutter G2 will be swung outward into operative position.

In the tube shown in Figs. 9 and 20, the tube A is separated by a longitudinal diaphragm (1, into two air passages a and a, the one provided with an inlet a and the other provided with an outlet at the incoming air being forced in through the airpassage 0, and the outgoing air carrying the borings, chips, &c., passing through the orifice n In all of the devices the operation is substantially the same. Thus the cutter is turned outa little at a time, and the tube A is revolved while at the same time air is blown therein. The air rushing out as shown by the arrows in Fig. 1, carries with it through the upper part of the borehole H, as shown in the said figure, or through the return passage a in the air tube, as shown in Fig. 9, the small particles of solid material cutout of the cavity h, thus leaving the said'cavity partly empty and ready for filling with the explosive used in blasting.

It will be evident that part of the bearings will remain in the said cavity h, butthe greater portion will be removed therefrom, and will be blown clear of the mouth of the bore hole.

It will be obvious that many modifications of the herein described devices might be made by any one skilled in the art which could be used without departing from the spirit of our invention.

Having thus described our invention, what we claim, and desire to secure by Letters Patent of the United States, is-

1. In a drill of the character described, the combination with a hollow tube slotted along an element thereof, means for revolving the said tube, of a toggle joint of hard metal mounted in said tube and adapted to move outward and inward through said slot, a rod mounted in said tube and having oppositely disposed screw threads adapted to engage nuts in the ends of said toggle joint and to open and close the same, means for turning said rod, and means for blowing air through said tube, for the purpose of carrying off the cuttings, substantially as described.

2. In a drill of the character described, the combination with an air pipe, of ahollow tube slotted along an element thereof and revolubly connected to said air pipe and receiving air therefrom, a pivoted cutter mounted in said tube, a rod mounted in said tube and adapted to move said cutter outward and inward through said slot, means for moving said rod, a fan mounted in said air pipe, and means for simultaneously revolving said tube and said fan, substantially as and for the purposes described.

3. In a drill of the character described, the combination with a hollow tube slotted along an element thereof, with perforations to admit air near the outer end thereof, of a toggle joint of hard metal mounted in said tube and adapted to move outward and inward through said slot; a rod mounted in said tube and adapted to operate said toggle joint, means for moving said rod; an air pipe, an air chamber connected to said air pipe and inclosing said tube over the perforations therein, a fan mounted in said pipe, and means for simultaneously revolving said tube and said fan, substantially as and for the purposes described.

4. In a drill of the character described,the combination with a hollow tube slotted along an element thereof, of an air pipe connected to said tube and opening thereinto, a toggle joint of hard metal mounted in said tube and adapted to move outward and inward through said slot, a rod having oppositely disposed screw threads adapted to engage nuts in the ends of said toggle joint and to open and close the same, means for turning said rod, a fan mounted in said air pipe, and means for simul- 

